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if it goes back and forth 2x in 5 seconds, 50 times that is 50x5 or 250 seconds, aka 3 min 10 sec
one example is a yoyo it goes side to side and back and forth there is an example of a pendulum
A line that goes straight acrosswould be ahorizontal line.
it lands back at 7 again , a straight angle always lands it on the opposite number on the clock therefore when you turn it 1 straight angle it lands at 1 the if you do it again it goes back to 7
It is a straight line.